Tried to install Debian 9, stuck at grub rescue. Bios is locked down with greyed out options. Supervisor password while correct but didn't work, now it is greyed out too. When I say Bios is locked down,, it means I can access it, but no options except system time and date, user password and HDD password, exit saving changes and exit discarding changes. I need help, please help. Acer Aspire E 15, E5-522-89W6. I built the USB bootable disc using cloudready USB maker. Changed the iso file name to .bin as required by cloudready.When turned on : error: secure boot forbids loading module from (hd0, gpt2)/grub/x86_64-efi/normal. Mod. Entering rescue mode.Please help.

As far as your problems with the bios, I think you may need to contact Acer support on that, or take it to a repair shop, that is authorized to do repairs on Acer equipment, but maybe somebody here will know more on that, we do have many members that use Acer's .... I don't think this really is a Debian issue, you used this "cloudready USB maker" and it made a usb device that has effectively damage or bricked your bios, maybe it can be repaired, I don't know.

From:https://neverware.zendesk.com/hc/en-us/community/posts/206683827-Installation-Problem Ok...I've tried 2 different working HP6730b laptops. Both have good drives and booted to Windows 7 just fine. They are old beaters so I thought I'd try the newly released free CloudReady. Sad to report that both are now bricked after trying the installation. Followed the directions step by step with no success. Reset Bios to factory defaults, made a second usb bin installer using the recommended Chromebook Restore utility only to get the same result. My above posts describes what's happening. If anyone has successfully installed the free version that was released yesterday ( Oct 1 ) I'd love to know the secret to making it work.

There are many more, so your best option is to contact them, at the cloudready community, and maybe they can help you unbrick your bios, After you have the laptop working again, DO NOT use this cloudready thing to make a usb stick for installing Debian with a usb device, read the Debian documentation and use the Debian way, methods,...

Debian can't work with UEFI Secure Boot enabled: it has no UEFI 'secure' key bought from Microsoft so the Secure Boot doesn't recognize Debian as a secure operating system. It does recognize Windows 10 as a secure operating system. Don't you just loooooooooooove Microsoft?

This combination means that you would need to use a distribution that has the required "secure key" mentioned by @Bloom, and there are a few but mostly Ubuntu (and derivatives) although there are some Debian derivatives too (Q4OS, SparkyLinux and others).

Unless you can gain access to the BIOS settings you will not (for now at least) be able to install standard Debian.

Thank y'all so much. I have taken these stepsRemoved bios battery for 1 hour.Removed laptop battery as well.Contacted Acer who won't help because of age of system. Might as well buy a new laptop per them.I had neverware installed on this system, so my options were limited on creating the bootable USB. Which is why I was leaving neverware for the sake of being free from limitations and privacy.I have a Chromebook, but again options are limited.I wonder if there is a way to connect bios to net and flash the bios? Lmao I know probably not. Or could I connect to a torrent through bios or grub rescue to flash the bios?

Noooo, I don't, .....I hate to hate, but I hate it. Fortunately we do not have to use it either.

I had a Acer Aspire series, (don't remember the number now) But it came with Windows XP, when it was new, my boss at work bought it for me. It was pre-UEFI, so that was not a issue, but I don't like using malware, so thefirst thing I did was install Freedos, I used a portable, USB optical drive to do the install from a CD, at that time FreeDos did not support USB , and the Acer Aspire's do not have optical drives, any way, now a days it is even easier, FreeDos can be installed on a USB boot stick, but don't use "neverware", you'll never get anywhere with this "neverware". Just learn how to use the Linux 'dd' command,.. Anyway, FreeDos installed fine, and with no issues, so once I had a clean system, with no malware on it, I was able go on to installing knoppix, my first experience with a Linux system.

Well, here I am. I took the CMOS battery out. Kept Laptop plugged into power. Restarted from usb containing cloudready ISO. I am now working on the laptop from that usb operating system. So now I changed the BIOS as all options are available. If I put the CMOS battery back in I wonder if BIOS will go back to locked down?Secondly, formating usb is not available for some reason.Thirdly, I am going to see if I can somehow install from the command line from this point. Or format the usb from command line. Not sure where to go from here. But at least I have a terminal ability where I didn't before.

I have reinserted the CMOS battery and the bios is now available.I have disabled secure boot and attempted to dd the downloaded Debian 9 net install to the USB drive.My system is cloudready from neverware running on USB since I don't have a OS Installed on my hardriveI cannot format USB from file menu. I cannot format USB from command line.I can not use the Debian install from USB because I can't seem to get downloaded file to USB in a bootable format.Error returns I have corrupt boot